摘要
将详细化学反应机理引入内燃机燃烧数值模拟会带来巨大的计算量,为了简化机理的构建.基于DRG及其衍生方法提出一种简化策略,即针对一种简化方法,从小到大选取阈值,形成多步简化,并在一种简化方法不能进行冗余组分的减少时,交叉使用其他简化方法,在保持较高的精度下,可大幅度减少组分和基元反应.运用该策略将LLNL3.1由654组分简化至162组分;将GRI3.0由53组分简化至26组分,分别与各自的详细机理进行对比,结果表明简化机理的模拟结果和详细机理的模拟结果吻合,说明该简化策略能很好适用于规模差别很大的两种机理的简化.并将正庚烷的简化机理和CFD耦合计算与实验结果对比,进一步验证了该简化策略的适用性.
The introduction of detailed chemical reaction mechanism into combustion numerical simulation of internal combustion engine will bring huge calculation,so the key to solve this problem is to reduce the mechanism.Direct Relationship Graph(DRG)and its derivative method are effective methods to reduce the chemical reaction mechanism.Based on the methods,a reduction strategy is proposed.For one reduction method,the threshold value is selected from small to large to form multi-step reduction.When one reduction method can not reduce the redundant components,other reduction methods are used alternately to achieve a significant reduction of components and elementary reactions with a high degree of accuracy.For the application of strategies,LLNL3.1 is reduced from 654 components to 162 components.GRI3.0 is reduced from 53 components to 26 components,and compared with their respective detailed mechanisms.The results show that the reduction strategy can be well applied to the reduction of two mechanisms with large scale differences.The reduced mechanism of n-heptane and the CFD coupling calculation are compared with the experimental results to further verify the applicability of the reduced strategy.
作者
刘玉坪
肖民
黄志伟
LIU Yuping;XIAO Min;HUANG Zhiwei(School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China)
出处
《江苏科技大学学报（自然科学版）》
CAS
2020年第4期43-50,共8页
Journal of Jiangsu University of Science and Technology:Natural Science Edition
关键词
直接关系图
机理简化
阈值
多次简化
direct relation graph
mechanism reduction
threshold
multiple reduction
